<android.support.v7.widget.Toolbar 
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
android:id="@id/toolbar" 
android:background="?colorPrimary" 
android:layout_width="fill_parent" 
android:layout_height="?actionBarSize" 
android:minHeight="?actionBarSize" 
app:popupTheme="?actionBarPopupTheme" 
app:navigationIcon="?homeAsUpIndicator" 
xmlns:app="http://schemas.android.com/apk/res-auto" />

    private void setToolbar() {

        View locView = findViewById(R.id.toolbar);

        setSupportActionBar((Toolbar) locView);

        ((Toolbar) locView).setNavigationOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                SettingsActivity.this.onBackPressed();

            }

        });

    }